Dynamo-electric machine.



J. B. ENTZ. DYNAMO ELECTRIC MACHINE. APPLICATION FILED JULY 5. 1913.

Patented Dec. 7, 1915.

2 SHEETS-SHEET I J. B. ENTZ.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULY 5. 1913.

1,162,991. Patented Dec. 7, 1915.

2 SHEETS-SHEET 2.

' M18668 x 2 Lu/en'oM yum; Q5. 42 5;

JUS'IUS TB. ENTZ,= 0F CLEVELAND, OHIO.

DYNAMO-ELEGTBIC MACHINE.

Application filed July 5, 1918. Serial No. 777,419.

To all whom it may concern:

Be it known that I, JUsTUs B. EN'rz, a citizen of the United States,residing at Cleveland, in the county of Guyahoga and State of Ohio, haveinvented a certain new and useful improvement in Dynamo-ElectricMachines, of which the following is a full, clear, and exactdescription.

This invention relates to electric starting and lighting apparatus formotor vehicles, and has for its principal object the provision of adynamo electric machine which is ellicient as a motor and as a generatorand is admirably adapted for the small space which r can be devoted to amachine of this character in a motor vehicle. Further, the inventionaims to provide a machine which while made as compact as possible,particularly in a lateral direction, nevertheless has high torque whenserving as a motor for starting purposes, and has the requisite currentoutput when serving as a generator for lighting and battery chargingpurposes.

1n the accompanying sheets of drawings, Figure 1 is a sectional ,viewthrough the frame and hood of a motor vehicle, and illustrates onelocation of the dynamo electric machine which is admirably situated forthe purpose of starting the engine, and for lighting purposes; Fig. 2 isa perspective view of the dynamo motor with one of the commutator coverplates removed; Fig. 3 is a perspective view of the field frame orhousing; Fig. 4 is a transverse sectional View of the same; Fig. 5 is alongitudinal sectional view of the same with the end covers and fieldwindings in place; Fig. 6 is an end view of the same looking toward thecommutator end of the field member, with the end cover removed; and Fig.7 is an inner side view of the end cover which is removed from Fig. 6.

In the drawings, 10 represents the side members of the chassis of themotor vehicle; 11 the internal combustion engine,and 12 the ho0d whichincloses the engine. The dynamo electric machine 13 is in this casearranged within the hood alongside of the engine and is mounted upon ashelf 14 which is above an auxiliary shaft 15, which may be the magnetoshaft and will be geared in the usual manner to the crank shaft of theengine, but such connecting gearing is not here shown.

This dynamo electricmachine, as will be understood, is to serve as amotor to turn Specification of Letters Patent.

Patented Dec. 7,191.).

over or start the engine, and after the engine is started, is adapted tobe driven as a generator for battery charging or lighting purposes. Onetrain of gearing only is used for transmission of power between theengine and dynamo electric machine, and in this case, the shaft of thedynamo electric machine is connected to the auxiliary shaft 15, by chainand sprocket gearing shown conventionally at 16 in Fig. 1.

It will be seen that with the dynamo electric machine located as in thepresent case, and in fact, it is true even if placed in some otherlocality, the machine must in view of the fact that there is littlespace which can be devoted to the same wherever it may be located, be ascompact as possible, consistent with the. degree of eflicienc currentoutput, and torque required. ith the machine mounted as here shown,there is of necessity little space for it between the engine and theside of the hood, and in consequence, the machine is made considerablysmaller in width than in height.

By reference to the drawings, it will be seen that the dynamo electricmachine includes a rectangular shaped field housing 17, which is nearlytwice as high as it is wide.

. This field member or housing 17 which is of the four pole type, has onits top and bottom avalls inwardly extending pole projections 18 towhich are secured pole pieces 19, provided with field coils 20. Inpractice, I provide both shunt and series windings on the poles 19 butin this instance, the two windings are taped together, and I do notregard it necessary for the purpose of this application to show theindividual parts of the windings.

The side walls of the housing are provided with very short integralinwardly projecting poles 21. The latter have no field coils, and infact are not suiliciently long for that purpose. It will be observedthat the lateral lnwardly projecting 'poles 21 are at their inner endscurved concentrically with respect to the axis of the machine, thelength of these oles and the radius of curvature being suc that at themiddle of the pole, the extended inner faces of the side walls areractically tangent with the curved ends of tile poles. The machineincludes also an armature 22, which compared with the width of themachine, is of considerable diameter, the diameter of the armature beingonly slightly less than the interior width of the housing. In fact, thedifierence between the inside width of the housing and the diameter ofthe armature is equal only to twice the clearance space between thearmature and any one of the pole pieces. This relatively large armaturediameter is an important factor in securing the high to que which thismachine possesses.

The forward end of the machine is closed by an end plate 23 in which oneendof the armature shaft is journaled. This end plate is provided on itsouter side-with a hood or guard 24: which incloses the upper sprocketwheel and a portion of the sprocket chain. In addition to this coverplate 23, the forward end of the housing is provided with an integralend. web 25 having a circular opening 25 which receives with a closefit, a circular flange 23 on theinner side of the end cover plate 23.The cover plate is secured in position by screws and is held fromdisplacement by these screws and by the Web 25 having the circularopening into which is fitted the circular flange of the end plate, beinof particular importance in reventing ownward dis lacement of the s aftand armature, due to the pull of the chain which transmits power to andfrom the armature shaft.

it will be observed that this web is provided adjacent the top andbottom walls with notched out portions 25 which are provided tofacilitate planing of the inner ends of the ole stubs or projections 18to which the po e shoes 19 are secured.

At the opposite or rear end of the machine, which is the commutatoren'd,the to and bottom walls of the housing are exten ed outwardly inthe form of a pair of projecting arms 26 to which is secured byfastoning screws,- a plate or bracket 27, considerably narrower than thewidth of the machine. The armature shaft is journaled in the forward endplate 23, and in the rear plate or bracket 27. As shown particularly inFig. 2, the commutator end of the housing is provided at the cornerswith two commutator covers 28 which are-removably secured to the housingand constitute closures for the housing, between the end plate orbracket 27, and the adjacent sides of the housing. c

The terminals of the different armature and field connections are allbrought out through the upper housing extension 26, the terminals beingshown conventionally at 29.- In view of the extreme compactness of themachine, the extension forms the most desirable and in fact the onlyavailable part through whichthe terminals can be brought.

In view of the fact that the diameter of the armature is nearly as greatas the internal widthof the machine, there would be insuflicient sside-walls o the housing for the connecting saidweb ace between thearmature and.

conductors extending between the upper and lower sets of field coils, ifthe inner sides of the side walls of the housing were extendeddownwardly in straight lines. To provide space between the side wallsand the armature for the conductors which ex-- tend betwen thefield-coils on the upper and lower poles 19, the inner faces of thehousing, at one or both ends of the machine at the side of the shortstub poles 21, are recessed or grooved outwardly opposite the armaturein conformity with the curvature of the armature as shown at 30, and theconnecting conductors shown at 31 are bent outwardly in said recesses,so as to clear the armature.

It will be observed by reference to Figs. 5, 6 and 7 that the end covermember 27 is secured to the ends of the extensions 26, and is centeredthereon by means of inwardly projecting arc-shaped lugs or ribs 27 whichengage within arc-shaped grooves or slots 26*. in the ends of theextensions 26. All surfaces of the field housing which are rounded orcut concentrically with respect to the axis of the machine, saidsurfaces including the inner ends of the pole projections 21, theinner-ends of the poles 19, circular opening 25 in the web 25, therecessed portions 30. in the side of the housing, and the arc-shapedslots 26 ,are all cut or turned with one centering of the housing. Thisreduces materially the cost of manufacture of the machine and insuresaccurate assemblage or alinement of the parts.

Having thus described my invention, what fl claim is: p

1. A dynamo electric machine comprising a. rectangular shaped fieldmagnet housing having integral top, bottom and side walls, and providedwith inwardly projecting pole pieces extending from the top and bottomwalls, an end plate closing one end of the housing, the top and bottomwalls of the opposite end of the housing being extended outwardly so asto form projecting arms of less width than said walls,

'ournaled in said end cover and'end plate, and commutator cover platesarranged at the corners of the housing on opposite sides of said endplate and arms.

2. A dynamo electric machine comprising arectangular shaped field magnethousing having integral top, bottom and side walls, and provided withfield pole pieces secured to the top and bottom walls and poleprojections integral with the side walls thereof, an end cover for oneend. of the housing, the top and bottom walls at the opposite end 0 thehousing being-extended outwardly to form n pe'ryand ower' rejecting armsof less wi th'than said we s, a plate extending-betweenaiidsecured tosaid arms, removable commutater'covers secured to the an end platesecured to the ends of said arms, an armature areaser ends or thehousing on opposite sides of said arms, an armature journaled in saidend cover and plate, and field and armature terminals extending throughone of said arms.

3. A dynamo electric machine comprising a rectangular shaped fieldmagnet housing of greater height than width, said housing having at oneend on the top and bottom walls a pair of centrally disposed outwardlyprojecting arms and'having at the opposite end an integral web partiallyclosing said end and provided with a centrally disposed opening, an endcover plate for the last named end of the housing, provided with aflange fitting said opening, a vertical'mem:

'ber extending between and secured to said arms, an armature rotatablysupported by said cover plate and said vertical member,

'and cover plates secured to the corners of the housing on oppositesides of said arms. 4. A dynamo electnc machine comprising a fieldmagnet housing having integral top,

bottom and side walls and provided with inwardly pro]ect1ng pole pieces,an end late closing one end of the housing, two 0 the walls at theopposite end of the housing being extended outwardl so as to formprojectingarms of less w1dth than said walls,

an end plate secured to the ends oi said arms, said end cover andend'plate, and commu ator cover-plates.

an armature journaled arranged at the corners of the housing on oppositesides of said end plate and arms,

5. A dynamo electric machine comprising I a field magnet housing havingintegral top,

bottom and side wails and provided with inwardly projecting pole pieces,an end plate closing one end of the housing, two of the walls at theopposite end of the housing be ing extended outwardly so as to formproecting arms of less wldth than said walls,

an end plate secured to the ends of said arms, an armature journaled insaid end cover and end plate, cominutator'cover plates arranged at thecornersof the housing on opposite-sides of said endplate and arms, andfield and armature terminals extending through one of said arms.

plates secured to the corners of the housing on opposite sides of saidarms. v r

In testimony whereof, I hereunto aflix my signature the presence of twowitnesses. I JUSTUS B ENTZ.

Witnesses: v L. I. Forum,

A. F. Kwrs.

